As a Texan I'm obligated to concur on whataburger however if I'm being truthful their consistency is all over the map too. I'm pretty sure it's a result of store level execution and management. Oddly enough, I find the best ones are those located in pit stop towns between the major cities. They get enough traffic to stay fresh, they probably have low turnover, and the manager might be making a career of it. That how I rationalize it anyhow.